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TLP Hints is a feature of PCI Express 2.1. Follow the link below to a paper that provides some additional info on PCIe 2.1 and 3.0:
I am told that the processor platforms currently shipping from Intel are at 2.0 level, not surprising considering the 3.0 spec was only recently published
While I can't make a direction statement on behalf of Intel, I think it's a no brainer that since Intel has spearheaded PCIe innovation ever since the inception of the original PCI that you will see 2.1 / 3.0 support in the processor future roadmap. In fact if you Google "Intel PCI Express 3.0" you will find third-party articles on the subject.
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I hope this helps.
J. Felix McNulty
Community Moderator (Intel contractor)